Lever-jack.



No. 723,558. Q PATENTED MAR. 24, 1903.

W. TREWHELLA.

LEVER JACK.

APPLICATION FILED MAR. 27 1902.

H0 MODEL.

UNITED STATES PATENT @FFIQE.

WILLIAM TREWHELLA, OF TRENTHAM, VICTORIA, AUSTRALIA.

LEVER-JACK.

SPECIFICATION forming part of Letters Patent No. 723,558, dated March 24, 1903. Application filed March 27, 1902- Serial No. 100,295. (No model.)

To all whom it may concern/.-

Be it known that 1, WILLIAM TREWHELLA, engineer, a subject of the King of Great Britain, residing at the Sunnyside Iron WVorks, Trentha'm, in the State of Victoria, Commonwealth of Australia, have invented an Improved Lever-Jack, of which the followingis a specification.

This invention has been devised in order to provide a lever-jack which while being adapted for general purposes will be specially suited for coach-builders, farmers, and others requiring to lift Wagons, farming implements, and the like in order to remove the wheels for oiling or repair.

In the accompanying drawings, Figure 1 is an elevation, and Fig. 2 a vertical section, of my improved lever-jack. Fig. 3 is an enlarged horizontal transverse section on line 3 3, Fig. 2, while Figs. 4 and 5 are fragmentary perspective sketches of parts hereinafter described. Figs. 6 and 7 are perspective views of the reinforcingblock and linerplate.

The casing or body A of my improved lever-jack is constructed of stout sheet metal bent around into an oval or tubular shape and having its meeting edges riveted together, while its lower end is fitted into a socketpiece B, forged or stamped out of sheet metal.

A reinforcing -block having vertical side cheeks or wearing-plates O, and transverse connections 0 is secured inside the casingor body, and a toothed rack-bar D is arranged to slide between said side cheeks or wearingplates 0 and to be raised by means of a lever E, fulcrumed upon a double link F, pivotally mounted in recesses or grooves R upon a pin or bolt G, passing through the upper end of the jack body or casing, said recesses B being formed in the back of a linerplate S, secured to the reinforcing-block C. The end of the short arm of this lever is fitted with a lifting-pawl H, adapted to engage the ratchet-teeth of the rack-bar D of the jack, and in order to insure said lifting-pawl remaining in engagement with said teeth when theweight is taken it is formed with a long tail or extension J, which can either pass through a guide-hole K in the transverse connection G on the reinforcing-block C (see Figs. 2 and 3) or the tail may be bent or curved, as

shown in dotted lines in Figs. 2 and 4, so that it bears lightly against the back of the casing, on the one side, and the transverse connection O, on the other, so that in either case the pawl is prevented from tilting.

A retaining-pawl L is pivoted upon the pin or bolt G, from which the operating-lever E is suspended, and its end is shaped to engage the teeth of the rack D, or if it is thrown back, as shown by dotted lines in Fig. 2, so that it will engage a projection M (or it may be a notch) upon the operating-lever and force same backward upon said lever being raised, thus tripping or disengaging the lifting-pawl from the rack-bar and allowing said bar to drop into its lowest position. The backward'movement of the lever is limited by the link F, abutting against shoulders 0, formed by the lower edge of the walls of the recesses or grooves R in the back of thelinerplate S and which act as stops.

The rack-bar D is guided vertically by studs or projections P on the inner face of the wearing-plates O of the jack, which project into grooves or guideways Qin said rack-bar, thus obviating the necessity for the frame being carried around the front of the rack-bar,thereby enabling the bottom supporting projection to be raised to a higher position than is possible with the generality of jacks.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- 1. In a lever-jack, an operating-lever fulcrumed on a backwardly-swinging link abutting against shoulders or stops, in combination with a retaining and tripping pawl and a projection or notch on said lever substantially as set forth.

2. In a lever-jack, a casing, an operatinglever,a lifting-pawlpivotally connected thereto and means preventing said pawl from rocking on its pivot, for the purpose set forth.

3. In a lever-jack, a casing, an operatinglever,a lifting-pawl pivotally connected thereto and provided with an extension or tail, and abutments in said casing preventing vibration of said tail and rocking of the pawl on its pivot, for the purpose set forth.

4. In a lever-jack, a casing, a reinforcingblock therein, an operating-lever, a liftingpawl pivotally connected thereto and having I rocking motion of the pawl on its pivot, for

a bent or curved extension or tail bearing against said block and casing to prevent vibration of said tail and rocking of the pawl on its pivot, for the purpose set forth.

5. In a lever-jack, a casing, an operatinglever, a backWardly-swinging link to which said lever is fulcrumed, stops in the casing against which the link abuts, a lifting-pawl pivotally connected to the lever and means preventing rocking motion of the pawl on its pivot, for the purpose set forth.

6. In a lever-jack, a casing, a reinforcingblock therein, a backwardly-swinging double link pivoted therein and stops against which the link abuts; in combination with an operating-lever fulcrumed to said double link, a lifting-pawl pivotally connected to said lever and provided with an extension or tail held against vibration by aforesaid reinforcingblock and the inner face of the casing to prevent rocking of the lifting-pawl on its pivot, for the purpose set forth.

7. In a lever-jack, a casing, a grooved or recessed liner-plate therein, a pivot-bolt passing through said recesses and through the casing and a backwardly-swinging double link pivoted in the recesses to said bolt; in combination With an operating-lever pivotally connected to the link, a lifting-pawl pivotally connected to thelever and means preventing the purpose set forth.

8. In a lever-jack, a casing, a grooved or recessed liner-plate therein, a pivot-bolt passin g through said recesses and through the easing, a backwardly-swinging double link pivoted in the recesses to said bolt, and a retaining and tripping pawl also pivoted to said bolt; in combination with an operating-lever pivotally connected to the 1ink,a lifting-pawl pivotally connected to the lever provided with an abutment adapted to be engaged by the aforesaid retaining-pawl and means preventing rocking motion of the pawl on its pivot, for the purposes set forth. I

9. An improved lever-jack having a bent sheet iron casing, guide studs engaging grooves in a rack-bar, an operating-lever fulcrumed on a double link mounted on a bolt also carrying a retaining and tripping pawl, a lifting-pawl on said lever having a long tail and a rei nforcing-block having wearing=plates within the casing substantially as set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

WILLIAM TREWHELLA.

Witnesses:

EDWARD WATERs, EDWARD WATERS, J r. 

